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地下实地 : 25 phrases in 9 subjects |
| Agriculture | 3 |
| Commerce | 1 |
| Desert science | 2 |
| Earth sciences | 1 |
| Economy | 1 |
| Engineering geology | 4 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geology | 1 |
| Technology | 11 |
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